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Re: Everything you know about the Iren Dabasu age is (right)




--- David Marjanovic <david.marjanovic@gmx.at> wrote:

> >> Palynomorphs still have big advantages: they
> occur
> >> in exorbitant numbers,
> >
> > Not in Mongolia; they are practically nonexistent
> > there.
> 
> Strange... if even keratin is occasionally preserved
> there...
> 
> >> It's indicative of a Maastrichtian age _and a
> >> certain environment_.
> >
> >  It occurs in fluvial environments from North
> America
> > to Omnogov to China.
> 
> Which fluvial environments?

 I presume the Hell Creek, Nemegt and Pinglng.

> 
> Rivers become braided when there's no vegetation
> that could consolidate the 
> soil. This lets me suppose that the Iren Dabasu
> environment was a rather dry 
> affair, probably with only seasonal rivers.


 The Nemegt wasn't much different.

> 
> >> >> The magnetostratigraphy mentioned in the above
> >> >> abstract suggests that the Barun Goyot,
> Djadoktha
> >> >> and Nemegt Formations are all upper Campanian-
> >> >> Lower Maastrictian in age,
> >> >
> >> > This makes no sense; they couldn't be
> >> > contemporaneous.
> >>
> >> Nobody said they were.
> >
> > Yes they did, see above, supposedly they are ALL
> > upper Campanian-lower Maastrichian in age.
> Supposedly
> > they all spanned the same chrons.
> 
> I read this differently. I interpret it as "they all
> fit within the interval 
> from the upper CMP to the lower MAA", not as "they
> all span that whole 
> interval" (which would BTW be a bit much... well
> over 5 million years!). 


 Hicks said 32R-32N-31R.
> 
> 



                
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